I made an object from an editable poly. I then selected all of the edges and created a spline from them. The problem is, I can't loft with this spline. I've tried with other splines created the same way, to no avail. Is there a way to get loft working with these types of splines, or another way to add real thickness? (as opposed to thickness only in the viewport/render - these objects are designed to be printed, so just adding viewport thickness doesnt work right?)